Occultation event with (51365) 00TA42, event index number 1317
Regions able to see the event: Europe
Geocentric closest approach at 2025/09/27 21:06:53 UTC
J2000 position of star is 01:50:00.9 +17:38:57
Equinox of date position of star is 01:51:25.2 +17:46:34
Star is 140 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 5.0 per integration for unocculted signal
Expected flux drop is 59% with SNR of 2.9 for the occulted depth (per occulted point)
Apparent velocity is 17.4 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 95.2 degrees
The recommended exposure time corresponds to 9.6 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 19.3 km.
The sky-plane scale is 3190.4 km/arcsec.
Diameter estimates:
42.9 km assuming a 5% albedo, aximum of 2.5 sec for a central chord
17.5 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 40.6 km used for deployment plan.
Star training set for 51365_00TA42, (2025/09/27 21:07UT) Object RA Dec mag sep mel Aldebaran 04:37:24.0 +16:33:32 0.8 39.59 169 6Bet Ari 01:56:04.0 +20:55:58 2.6 3.34 143 107 Psc 01:43:53.9 +20:23:34 6.0 3.16 140 PPM 117731 01:53:04.7 +17:55:23 8.0 0.42 141 PPM 117697 01:50:10.7 +17:54:53 11.5 0.33 140 51365_00TA42 01:51:25.2 +17:46:34 15.8 141 Positions are for equinox of date
Star training set for 51365_00TA42, (2025/09/27 21:07UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 39.59 169 6Bet Ari 01:54:38.6 +20:48:26 2.6 3.34 143 107 Psc 01:42:29.2 +20:15:49 6.0 3.16 140 PPM 117731 01:51:40.3 +17:47:48 8.0 0.42 141 PPM 117697 01:48:46.4 +17:47:15 11.5 0.33 140 51365_00TA42 01:50:00.9 +17:38:57 15.8 140 Positions are for J2000